Re: LF: water heated by soundwaves

[Rik Strobbe <rik.strobbe@fys.kuleuven.be>]

George,

ultrasonic waves are "shockwaves" (just like sound, only at
higher frequency) that change the density of the medium. A complete
different mechanism than electromagnetic waves.
If you add energy into the water, no matter how, it will heat and
eventually boil. Nothing to be stunned about.
Ultrasonic waves have been used for ages to heat stuff. Big advantage is
that the energy can be focused to one spot to get local heating.
Ultrasonic ovens It has also been proposed as "save
alternative" to microwave ovens, but with little success as it
turned out to be very expensive to build an oven that would withstand the
vibrations.

73, Rik ON7YD - OR7T

At 02:47 31/01/2008, you wrote:
> hi a most
> interesting news item on nz tv..An elderly gent. (90s) has got a device
> where he inserts a sphere into a large tumble of water and after a short
> period the warter boils..he says its done bye ultra sonics...It has
> stunned professors and science standards...he wont let on much...thats
> the million dollar question just ??? i got a feeling the highfreqency
> audio electric current is heating the water ..BUT IS IT....george
> zl3pn


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